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Interpretation of Digital Mammograms: Comparison of Speed and Accuracy of Soft-Copy versus Printed-Film Display¹

¹ From the Dept of Radiology (E.D.P., E.B.C., B.M.H., M.L.B., R.E.J., C.M.K.) and UNC-Lineberger Comprehensive Cancer Ctr (E.D.P., E.B.C., M.L.B.), Univ of North Carolina School of Med, 101 Manning Dr, 515 Old Infirmary, Chapel Hill, NC 27599-7510; Dept of Biostatistics, Univ of North Carolina School of Public Health, Chapel Hill (E.O.K., K.E.M.); Dept of Radiology, Christ Hosp, Cincinnati, Ohio (M.P.B.); Dept of Radiology, Wake Forest Univ School of Medicine, Winston-Salem, NC (R.I.F.); and Dept of Radiology, Duke Univ School of Med, Durham, NC (M.S.S., J.A.B., R.W.). From the 1999 RSNA scientific assembly. Received Mar 29, 2001; revision requested May 23; revision received Oct 4; accepted Nov 12. Supported in part by Department of Defense Grant 5-36845, "Evaluation of Digital Mammography Display." Address correspondence to E.D.P. (e-mail: etta_pisano@med.unc.edu).

PURPOSE: To compare the speed and accuracy of the interpretations of digital mammograms by radiologists by using printed-film versus soft-copy display.

MATERIALS AND METHODS: After being trained in interpretation of digital mammograms, eight radiologists interpreted 63 digital mammograms, all with old studies for comparison. All studies were interpreted by all readers in soft-copy and printed-film display, with interpretations of images in the same cases at least 1 month apart. Mammograms were interpreted in cases that included six biopsy-proved cancers and 20 biopsy-proved benign lesions, 20 cases of probably benign findings in patients who underwent 6-month follow-up, and 17 cases without apparent findings. Area under the receiver operating characteristic curve (A_z), sensitivity, and specificity were calculated for soft-copy and printed-film display.

RESULTS: There was no significant difference in the speed of interpretation, but interpretations with soft-copy display were slightly faster. The differences in A_z, sensitivity, and specificity were not significantly different; A_z and sensitivity were slightly better for interpretations with printed film, and specificity was slightly better for interpretations with soft copy.

CONCLUSION: Interpretation with soft-copy display is likely to be useful with digital mammography and is unlikely to significantly change accuracy or speed.

© RSNA, 2002

Index terms: Breast radiography, 00.112 • Diagnostic radiology, observer performance • Images, display • Radiography, digital, 00.1215 • Screens and films, 00.112

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